Subscription television
United States Patent 3107274

Inventors:
Roschke, Erwin M.
Publication Date:
10/15/1963
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Assignee:
ZENITH RADIO CORP
Primary Class:
380/240
Other Classes:
348/E07.055
International Classes:
H04N7/167
US Patent References:
2757226Secret television systems
2823252Subscription television system